Double Star Calculator - Orbit

Orbital Elements for BU947AB

WDS:	BU947AB	WDS ID/Discoverer
P:	220.000	Orbital period (years)
a:	0.851	Semi-major axis (arcseconds)
i:	75.7	Inclination (degrees)
Ω:	80.2	Longitude of ascending node (degrees)
T:	2054.500	Epoch of periastron passage (year)
e:	0.685	Eccentricity
ω:	242.2	Longitude of periastron (degrees)
Start-Year:	1915.0	Year
End-Year:	2135.0	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for BU947AB
Position:	160526.23-194819.4	Epoch-2000 right ascension and declination
WDS-ID:	16054-1948	WDS designation
Discoverer Code:	BU947AB	Discover designation and components
ADS number:	9913	Aitken Double Star catalog
HD number:	144217	HD catalog number
Hipparcos number:	78820	Hipparcos catalog number
V1:	2.62	Magnitude of the primary
V2:	10.6	Magnitude of the secondary
Equinox:		Equinox
Date:		Date of last observation
Orbit grade:	3	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Tok2024c	Reference

Double Star Orbit for BU947AB

WDS 6th Orbit including measures of BU947AB

-- Image from the USNO WDS 6th Orbit Catalog (see Acknowledgements) --

Legend:

Green plus signs:	Visual (micrometric) measures
Violet asterisks:	Photographic measures
Blue symbols:	Various interferometric techniques
Dot-dash line:	Indicates the line of nodes

Ephemeris of BU947AB

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.359   229.75
--------------------------
1915.00    0.922    96.26
1916.00    0.917    96.51
1917.00    0.913    96.77
1918.00    0.908    97.02
1919.00    0.904    97.28
1920.00    0.899    97.55
1921.00    0.894    97.81
1922.00    0.889    98.08
1923.00    0.883    98.35
1924.00    0.878    98.63
1925.00    0.872    98.90
1926.00    0.867    99.19
1927.00    0.861    99.47
1928.00    0.855    99.76
1929.00    0.849   100.06
1930.00    0.842   100.35
1931.00    0.836   100.66
1932.00    0.829   100.97
1933.00    0.823   101.28
1934.00    0.816   101.60
1935.00    0.809   101.92
1936.00    0.802   102.25
1937.00    0.795   102.58
1938.00    0.788   102.92
1939.00    0.781   103.27
1940.00    0.773   103.62
1941.00    0.766   103.98
1942.00    0.758   104.35
1943.00    0.750   104.72
1944.00    0.742   105.11
1945.00    0.735   105.50
1946.00    0.727   105.90
1947.00    0.718   106.31
1948.00    0.710   106.72
1949.00    0.702   107.15
1950.00    0.694   107.59
1951.00    0.685   108.04
1952.00    0.677   108.50
1953.00    0.668   108.97
1954.00    0.660   109.45
1955.00    0.651   109.95
1956.00    0.642   110.46
1957.00    0.633   110.98
1958.00    0.625   111.52
1959.00    0.616   112.08
1960.00    0.607   112.65
1961.00    0.598   113.24
1962.00    0.589   113.84
1963.00    0.579   114.47
1964.00    0.570   115.11
1965.00    0.561   115.78
1966.00    0.552   116.47
1967.00    0.543   117.18
1968.00    0.534   117.92
1969.00    0.524   118.68
1970.00    0.515   119.47
1971.00    0.506   120.29
1972.00    0.497   121.14
1973.00    0.487   122.02
1974.00    0.478   122.93
1975.00    0.469   123.88
1976.00    0.460   124.87
1977.00    0.451   125.90
1978.00    0.442   126.97
1979.00    0.433   128.08
1980.00    0.424   129.24
1981.00    0.415   130.45
1982.00    0.407   131.72
1983.00    0.398   133.03
1984.00    0.390   134.41
1985.00    0.381   135.84
1986.00    0.373   137.34
1987.00    0.365   138.90
1988.00    0.358   140.53
1989.00    0.350   142.24
1990.00    0.343   144.01
1991.00    0.336   145.86
1992.00    0.329   147.79
1993.00    0.323   149.80
1994.00    0.317   151.89
1995.00    0.311   154.06
1996.00    0.305   156.31
1997.00    0.300   158.63
1998.00    0.296   161.04
1999.00    0.292   163.51
2000.00    0.288   166.05
2001.00    0.285   168.65
2002.00    0.282   171.31
2003.00    0.280   174.01
2004.00    0.278   176.75
2005.00    0.277   179.51
2006.00    0.277   182.29
2007.00    0.277   185.08
2008.00    0.277   187.86
2009.00    0.278   190.62
2010.00    0.280   193.36
2011.00    0.282   196.06
2012.00    0.285   198.72
2013.00    0.288   201.32
2014.00    0.291   203.86
2015.00    0.295   206.34
2016.00    0.300   208.75
2017.00    0.304   211.09
2018.00    0.309   213.36
2019.00    0.315   215.55
2020.00    0.320   217.67
2021.00    0.326   219.71
2022.00    0.332   221.69
2023.00    0.338   223.59
2024.00    0.344   225.43
2025.00    0.350   227.20
2026.00    0.356   228.92
2027.00    0.362   230.57
2028.00    0.368   232.17
2029.00    0.374   233.71
2030.00    0.380   235.21
2031.00    0.385   236.67
2032.00    0.391   238.09
2033.00    0.396   239.47
2034.00    0.400   240.81
2035.00    0.404   242.13
2036.00    0.407   243.43
2037.00    0.410   244.70
2038.00    0.412   245.96
2039.00    0.413   247.21
2040.00    0.413   248.46
2041.00    0.412   249.71
2042.00    0.409   250.98
2043.00    0.405   252.26
2044.00    0.399   253.58
2045.00    0.391   254.95
2046.00    0.380   256.38
2047.00    0.366   257.91
2048.00    0.349   259.58
2049.00    0.328   261.44
2050.00    0.303   263.57
2051.00    0.274   266.14
2052.00    0.239   269.38
2053.00    0.201   273.80
2054.00    0.159   280.45
2055.00    0.117   291.90
2056.00    0.082   314.64
2057.00    0.070   355.03
2058.00    0.093    29.84
2059.00    0.133    47.41
2060.00    0.177    56.53
2061.00    0.221    62.00
2062.00    0.264    65.65
2063.00    0.305    68.29
2064.00    0.344    70.32
2065.00    0.381    71.94
2066.00    0.417    73.28
2067.00    0.450    74.42
2068.00    0.481    75.41
2069.00    0.511    76.27
2070.00    0.538    77.05
2071.00    0.565    77.75
2072.00    0.590    78.39
2073.00    0.613    78.98
2074.00    0.636    79.53
2075.00    0.657    80.04
2076.00    0.677    80.52
2077.00    0.696    80.97
2078.00    0.714    81.40
2079.00    0.731    81.81
2080.00    0.747    82.20
2081.00    0.762    82.57
2082.00    0.777    82.93
2083.00    0.791    83.28
2084.00    0.804    83.61
2085.00    0.816    83.94
2086.00    0.828    84.25
2087.00    0.839    84.56
2088.00    0.849    84.86
2089.00    0.859    85.15
2090.00    0.868    85.44
2091.00    0.877    85.72
2092.00    0.885    85.99
2093.00    0.893    86.26
2094.00    0.901    86.53
2095.00    0.907    86.79
2096.00    0.914    87.04
2097.00    0.920    87.30
2098.00    0.925    87.55
2099.00    0.930    87.80
2100.00    0.935    88.04
2101.00    0.939    88.28
2102.00    0.943    88.53
2103.00    0.947    88.76
2104.00    0.950    89.00
2105.00    0.953    89.24
2106.00    0.956    89.47
2107.00    0.958    89.70
2108.00    0.960    89.93
2109.00    0.962    90.17
2110.00    0.963    90.40
2111.00    0.965    90.63
2112.00    0.965    90.85
2113.00    0.966    91.08
2114.00    0.966    91.31
2115.00    0.966    91.54
2116.00    0.966    91.77
2117.00    0.966    92.00
2118.00    0.965    92.22
2119.00    0.964    92.45
2120.00    0.963    92.68
2121.00    0.962    92.91
2122.00    0.960    93.14
2123.00    0.958    93.38
2124.00    0.956    93.61
2125.00    0.954    93.84
2126.00    0.952    94.08
2127.00    0.949    94.31
2128.00    0.946    94.55
2129.00    0.943    94.79
2130.00    0.940    95.03
2131.00    0.937    95.27
2132.00    0.933    95.52
2133.00    0.930    95.76
2134.00    0.926    96.01

Disclaimer

This result is provided without warranty. For all terms, see the Full Disclaimer. Copyright (C) 2025. Unless otherwise noted, all output generated by the Double Star Calculator including orbit diagrams, ephemerides, and analytical reports is licensed under CC BY 4.0.

Acknowledgements

The Double Star Calculator - Orbital Elements makes use of the Washington Double Star Sixth Catalog of Orbits of Visual Binary Stars, maintained at the U.S. Naval Observatory.

Report Information

Double Star Calculator:		Version 1.2 ($Rev: 2397 $)
Report created:		2026-06-25 17:22:25